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A Dell PowerEdge server that's packing four Intel Xeon X7550 CPUs that each have six-cores and Hyper Threading with a 2GHz base frequency with 2.4GHz Turbo Frequency and 18MB of L3 cache, is the current winner in that category as shown by doing this dynamic comparison.

1 / 800 vs 1 / 256 = SB is more than 3 times more efficient.
OK, Bulldozer runs at 2GHz, SB runs @ 3.2GHz, let's take it into account.
1 / 800 / 2 vs 1 / 256 / 3.2 -> SB is still 2(!) times more efficient.
I guess we'll have to see the desktop version of Bulldozer to draw any conclusions. I doubt any existing computational test today can scale to 32 cores without some major performance loss.

you calculate wrong because: an 16 core bulldozer do only have 8 real-full-featured-cores.

the OS only count 32cores in this test because its much better to use this 16 cores as a 32core.